Williamsport, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Williamsport, a city in Lycoming County, Pennsylvania.
Overnight
44°F
Patchy Fog
Patchy fog. Partly cloudy, with a low around 44. East wind around 1 mph.
7-day forecast for Williamsport
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 44°F | Patchy Fog | 1 mph E | 0% |
| Wednesday | 72°F | Patchy Fog then Mostly Sunny | 0 to 8 mph SE | 1% |
| Wednesday Night | 58°F | Mostly Cloudy then Light Rain | 7 mph E | 93% |
| Thursday | 72°F | Light Rain | 3 to 8 mph S | 96% |
| Thursday Night | 49°F | Slight Chance Light Rain then Mostly Cloudy | 2 mph W | 24% |
| Friday | 66°F | Partly Sunny | 2 mph S | 12% |
| Friday Night | 44°F | Partly Cloudy | 0 to 5 mph NW | 12% |
| Saturday | 58°F | Chance Light Rain | 5 to 10 mph W | 35% |
| Saturday Night | 39°F | Chance Light Rain | 8 to 12 mph W | 35% |
| Sunday | 57°F | Partly Sunny | 10 mph W | 7% |
| Sunday Night | 36°F | Partly Cloudy | 8 mph W | 7% |
| Monday | 57°F | Mostly Sunny | 8 to 14 mph W | 13% |
| Monday Night | 34°F | Partly Cloudy | 3 to 7 mph W | 13% |
| Tuesday | 61°F | Mostly Sunny | 5 to 12 mph W | 6% |
Forecast source: National Weather Service (api.weather.gov) for Williamsport (41.240, -77.036). Updated through the day.
Growing snapshot for Williamsport
Last spring frost
Apr 25
First fall frost
Oct 24
Growing season
181 days
Hardiness zone
6b
More local growing data for Williamsport: nearby ZIP 17702 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Duboistown
Faxon
Garden View
Hughesville
Jersey Shore
Kenmar
Montgomery
Montoursville
Muncy
Oval
Picture Rocks
Rauchtown
Salladasburg
South Williamsport
Climate data from the nearest NOAA station, Williamsport 2, Pa (6.6 mi from Williamsport). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.